Electrochemical Inhibition Studies on Carbon Steel in Acidic Medium via Friendly Anise Oil with Gamma-Irradiated Rays

As Anise oil (AO) is considered a green inhibitor of carbon steel (CS) corrosion, the electrochemical behavior of CS was examined by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization to calculate its corrosion resistance in 0.5 M hydrochloric acid containing different concentrations of AO before and after irradiation with γ-rays (5 kGy and 15 kGy). Potentiodynamic polarization proved that the highest value of inhibition efficiency is 95.3% obtained by 50 ppm AO after irradiation with γ-rays at 298 K. The EIS results indicate that the changes in impedance parameters are related to the adsorption of AO and its coverage of the CS surface. A scanning electron microscope (SEM) was used to distinguish between the corroded surface and the unharmed surface due to the irradiated AO inhibitor. All the present results emphasize the power of using AO as a green inhibitor with γ-rays that can protect the CS surface, which will extend its industrial applications with high efficiency.